Does this resin need a warm room to cure in?
Yes, Super Sap Epoxy Resin needs to have room temps to cure properly and will cure faster at slightly higher temps no more than 49c / 120f. Learn More About Super Sap Bio Epoxy Here: https://entropyresins.com/community/question-category/generaluse/
Is this resin safe on epoxy boards with styrofoam cores and polyester boards with polyurethane foam cores too?
Yes, Super Sap Epoxy Resin is safe on styrofoam and polyurethane core boards and used by some of best known surfboard names in the world.
My resin has become solid inside the container. How can I make it liquid again?
Cooler temperatures can cause the epoxy resin to become solid due to the high bio-content. Carefully submerge the lower half of the tightly closed container of epoxy in warm water until epoxy returns to a liquid state. Placing the container in a warm room is slower, but will also work.